Pull-switch



A. H. NERO.' PULL SWITCH. APPLICANON FILE() *13.12.1919.

Patented Deu. 27, 1921.

umn-:D sTArrsljrENr orifice.

envio H. Nano, or Naw BRITAIN. CONNECTICUT, Assioma :ro rara' i@.anow marooomrmr, or HARTFORD, CONNECTICUT, a ooaronafrron or oonnnorrona'.

PULLfswrrc'H.

Speeiication tif-Letters Patent.

Patented Dec. 27, 19251.

Application zum February 12, 1919. serial Na 276,467.

To alilwwkom t may concern: Be it known that I, Alwin H.V Nano, a oitizenof the United States, and a resident of the city of New Britain, county of Hartford.;v and State of Connecticut, have invented certain new and useful Improvements 1n PulLSWitches, of which the following is a speclhcation. v I

My invention relates to pull switches, and particularly to a switch operating mech' anisni. the object of my .invention being to l a switch of the general hill and rype, in which a quicker and Wider breala;i between the switch bar and the switch terminals is attained than has hitherto been secured in switches of this type. The :in- Vention involves certain other features of improvement shown in the accompanying drawings, in which, i

ligure 1 is a dropped perspective of a pull socket interior in which the switch forming the subject matter of my invention illustrated; y

Fi' i? is a broken vertical section through `to pull switches of various types I have illustrated it in the accompanying drawingf embodied in a lamp socket. The usual metallic casing is shown in Fig. 2, and coinprises a cap 1() and shell'll, which house the insulating body of the socket carrying screw shell contact,12 and center contact 13. The socket body comprises a pair of in'- lill sulating buttons 14 and lspaced apart by standards 165` 1( and 18, to afford a chamber for the reception of the switchmechanism. The standards 16 and 1,7 are adapted toreceive binding; screws 19 for the respective lead, wires which as's thereto through marginal channels 20 1n the upper button 111-. The standard 17 is provided with a foot piece' 21, 'which overlies the base flange of the screw shell 11 and makes directy electrirail connection therewith.' The standard 16 oilset at one end to form a switch termitral $22, provided with a lug.23 engaged by a screw holt 24 passing through the buttoa '15. The co erating switch terminal .:rllii-,s diametrica y ppposte the terminal 22 and is provided lsockets and 31,

. in both directions, i.

with a lug 26 pierced by the screw bolt 27, the head of which overliea the base of the center contact Within the switch chamber inclosed beu tween the buttons la and 15 and the insu lating lining 2S of the socket, is arranged the switch mechanism It is mounted upon a spindle 29 freely journalcd in. bearii'ip; formed in the uppeigand lower buttons7 respectively. A well 32 r r,.- centric with and opening tothe spindle bearing 30 in the button 1a, receives the upper end of the ratchet return spring 33, the offset terminus 34 of which is engaged in a slot 35 opening to the well 32 andiserving tohold this end of the spring against rotation. The offset terminus 236 at the oppositeend of' the Spring engages a tongue 37 struck up from the' tension adjustment disk 38, which has a hearing hub 39 free on spindle 29. downward from diskld engage arms il oit the star plate 42 in'a direction to insure the rotation of said `disk and star plate together e., either clockwise under the torsion of the spring- 33, or cinitra clockwise under the pull of the chain engaging the chain rail, fill, which is insu lated from the star plate 49; by the usual fiber carrier sheet. It is obvious that by rotating the adjusting disk 38 quarter turns contra-clockwise With relation to the star plate 42, the tension of the spring 33 may be increased as far as desirable to insure a prompt return oi the chain rail after actu ation of the switch. This construction of the adjusting mechanism for the return spring is not only cheaper than the usual displaceable abutment engaging the` button 14 but hasythe advantage of enabling 'the manufacturer to-permanently adjust the return springr to proper tension before the Switch leaves the factory. Where the ad, justing abutment is readily accessible to the Wireman it fre uently happens that execs sive tension is pqlaced on the spring 33. with resulta-nt strain on ,the parts which injuriw ously affects the switch mechanism if it does not actually cause rupture of the spring rendering the adjuster inaccessible to the wireman, the correct tension imparted to the Spring'at the factory is practically assured of ermanency.

gelow the star plate lil is a ratchet dislr 44, having tongues 11p-turned into on Il tl rcuate teeth 4l() struck lili ica

gagenient with the arms' 410i thestar plate 42. .'Thisiatchet disk l44 is rigid with the? spindle,the' :tower 'portion of which isienlarged to forml an abutting shoulder to which the T ink soldered. "Extending downwardly ,froz'the opposite margins .o f the disk 44ers arcuatetgngues 46 -inciined at anffevngls ot about 45- tothe .piene of the disk 44, and engaging me?. inni notches i@ 4.7 in the body 48 ofthe switcI '.har which carries'-at itsoppoSite ends the, conta :t brushes 49 and 50. Between the ratchet disl: 44 and the switch har-48 is ireely interposed a coil spring 51, the function o .which is to 1liv force the switch har down upon its hill and valley course. The switch terminals 22 and 25 upon which .the brushes. 49.and 50 of theswitch bar hear Cin the on position of the switch alternate with arcuate ratchet bosses 52 `and 53 formed in the hutton'l surrounding the bearing recess l-for 'the spindle 29 and fthe concentric circular recess 54, which affords ya clearance for the arcuate tongues 46 of the 25 ratchet plate as they rotate during the actua-V tion of the switch.v The crests of the bosses 52and 53 terminate sharply atpoints' well above adjacent portions of the terminal strips'22and 25, 'which atthese ends are B0 substantialy fiat, but attheir other-'ends 55 and 56 are inclincdupwardly. These ends 55 and 56 and the inclins of the ratchet bosses 52, 58 serve as detente whichV delayl the' throw'of the switch har and insure-a quick Inake-and-lorealrV between `the contacts when theswitch is actuated. l

The operation'of .the mechanism isi-readily understood ';-,-15iss'umingv the spring 33 to :have been piaced under proper tension'by ed' the rotary .adjustmentof the disk 38 with relation tothe star plate42, the chain rail "is vihaltedfiin .normal stop 'position hy the impingement of its `ber carrier plate against fthe'` standard' 17, If the p chain @is now lpulled out lthrough the, chain hell .57 in standard 18,.the"star plate is rotated against the action'otits return spring 33 in adir'ectionto carry' with it the ratchet Adisk 44 by. ,reason of the engagement of `its tongues 45 lwithth earni's 41. ofthe star plate. During this rotation the arcuate tongues 46 ofthe ratchetv disk 44 which are in. engagement with the notches 47 in the switch har 48, 4cause the brushes 49 and. 50 of the latter to travel-up the inclines of `the ratchet bosses 52,53, or the upwardly inclined ends 55,i 56 ci the switch'terminals. As the switch bar advances its rotation is increasingly' op- .posed .by the inclines of its course hy reason of the pressure' of the spring' 51, which isfgradually compressed against theD ratchet disk fast on. the spindle 29. The opposition to`its rotation causes the switchhar to lag behind the ratchet disk44, and to ride 65 upthe inclined sidesl of its arcuate tongues switch har brushes 49 and 50. A much .heavier current may be safely broken in a ating the rotor.

-up the inclines thereof on 'thrown rapidlyl forward in the direction of its' rotation as it rides-down'the inclines of 70 the tongues The latten-thus impart 'a fp'ositiue forward throw "to the switch har,

and materially increase the distance of the l break between 'the-terminals 22, 25, and the switch ofvthis-constructicn 'than'is now pos. siblein switches' of this general type. Y

Obviously upon release of the chain the return spring 33 .rotates the carrier 43 back to stop position,riding the star plate 42 over the ratchet disk 4 4 and placing the arms 41 in position to engage the ratchet teeth 45 and move the switch bar to its next osition'- on the succeeding pull of the chain -v I do not limit my invention to the precise form shown for the arcuate tongues 46, or to other` details of construction shown and defscribed, which may be'variously modified wit-houtvdeparting from what/ claim'as my invention. I claim:

-11. `Ain electric switch of the hill and valley type, comprising a rotary switch har followin the hill and valley course, a switch 'spind e .on which said bar freely rotates, an

actuating rotor' on the spindle, -said rotor having inclined arms spaced from the spindle and engaging said switch harl andi up which the latter rides during the rise of A10Q said bar over the hills of its course, and spring means interposed between said rotor and switch har to force the har' down said inclines with a positive forward throw in' the directiony of its rotation after passing the crest of a hill m its course.

2. ln'an electric switch of the construction specied in claim 1, ratchet means for oper 3. ln en electric switch of the construc- 4110 tion specified in claim 1, the switch bar heing recessed to receive the inclined arms of the rotor.

Q4. In an electric switch of .the constructlo'n. specified in claimy 1, the switch -bar 11B being marginally notched to receive the inclined armsl of the rotor.

5. lin-an electric switch an actuating rotor comprising a plate having offset arms provided with cam inclines in combination with a switchbar," having guide ways through 1 which said arms pass as the switch bar rides*l the actuation of the switch.

6. In un electric switch, an actuating ratchet, a return spring for rotating' the with relation tothe ratchet to regulate the spring tension, and means for detachahly 130 engaging saidv disk and ratchet to insure '8 The combination with a construction their synchronous rotation durng thc operasuch as speced in claim Lof a swtoh body tion o the switch. 4 and a, Xed engagement between said body 10 7. `The-combnation with a construction and the opposite end. of the retum spring '5 such as4 s ifcd in clim 6, of a fixed In testimony whereof 1 have signed my abutment;V or `the opposite ,end o return name. to this specification. spring. ARVID H. NERO. 

